In the changing room of a large clothings store. Went in with my friend to try out some figure hugging dresses. I took all my clothes off including bra and knickers to slip on a dress I intended to wear commando. The next thing I knew my friend had her hand between my legs and was kissing me. I got wet instantly and couldn't resist. She slipped her middle finger up my twat , fucking me hard and sucking on my stiff nipples. The thought of doing it in public coupled with the fact that people in the adjacent cubicles could be listening got me off quickly to an shattering orgasm. It was one of the best quickies I've ever had.